Knockout videos show disturbing trend

Hadley Malcolm hosts USA NOW on a new "game" that has teens trying to knock random passersby unconscious with a single punch.

http://archive.freep.com/VideoNetwork/2851262689001/Knockout-videos-show-disturbing-trendrtmp://cp17277.edgefcs.net/ondemand/&mp4:Brightcove/Brightcove2/29906170001/2013/11/29906170001_2851342730001_1119-NOW.mp4http://archive.freep.com/VideoNetwork/2851262689001/Knockout-videos-show-disturbing-trendhttp://www.gannett-cdn.com/-mm-/50117b4bfe181f32492ec4d414638d7c08e560e6/r=500x400/local/-/media/usatoday/usatoday/2013/11/19/1384877688000-screen-shot-2013-11-19-at-111402-am.jpgKnockout videos show disturbing trendHadley Malcolm hosts USA NOW on a new "game" that has teens trying to knock random passersby unconscious with a single punch.8278dcWashingtonnationalusatfeaturedkaveh rezaeiknockoutUSANOWSt. LouisNewsUSA NOWUSA Todaynationusathadley malcolmusatodayNew Yorkknockout gamechicagoNew Jersey01:15